Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1819312 | Physica C: Superconductivity and its Applications | 2009 | 4 Pages |
Abstract
In order to explore a superconducting mechanism on iron-based superconductors, we numerically study a two-band minimal model considering two degenerate dxz and dyz orbitals on Fe atom. We perform exact diagonalization on a two-band and two-leg square ladder totally composed of 10 lattice sites, which is computationally equivalent to 4-leg 20-sites square-Hubbard-ladder. Consequently, we find that a robust pairing occurs in a wide parameter range when the intra-orbital repulsive interaction becomes smaller than the inter-orbital one. Moreover, the obtained binding energy can grow into much larger value than that obtained in the single band Hubbard model depending on the parameter range.
Keywords
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Condensed Matter Physics
Authors
M. Okumura, N. Nakai, H. Nakamura, N. Hayashi, S. Yamada, M. Machida,